Shou and his friend Tetsurou discover a mysterious orb‑shaped device deep in the woods. When Shou bonds with it, the Guyver Unit transforms him into an alien soldier known as Guyver. He is tasked with guarding this powerful unit from the Japanese corporation Chronos, which is determined to acquire it along with two other similar units. To retrieve the Guyver Units, Chronos unleashes vicious monsters called Zoanoids. As a result, no one, Shou included, is safe in this relentless conflict.